Automatic damper-regulator



W. V. ROBINSON.

-AUTOMATIC DAMPER REGULATOR.

APPLICATION FILED |\'OV.10, 19H?- Patented May 31, 1921.

WILLIAM V. ROBINSON, OF QNOSSO, MICHIGAN, ASSIGNOR T0 INDEPENDENT $TG -IE COMPANY, OF OXVOSSO, IVIICHIGAN,

A CORPGRATION OF MICHIGAN.

AUTOMATIC DAMPER-REGULATOR.

Specification of Letters Patent.

Patented May 31, 1921.

To (:53 whom it may concern.

Be it known that I, VVILLIAM V. ROBIN- soN, a citizen of the United States of America, residing at Owosso, in the county of Shiawassee and State of Michigan, have invented certain new and useful Improvements in Automatic Damper-Regulators, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to automatic damper regulators and is designed particularly for use upon furnaces. One object of the invention is the provision of a simple construction which will automatically control the movement of a draft door of a furnace thereby controlling the heat. Another object is to provide a construction which can be readily assembled and which comprises but few parts. Other objects of the invention reside in the novel arrangements and combinations of parts as more fully hereinafter set forth.

In the drawings:

Figure 1 is a side elevation partly in section of a construction embodying my invention;

Fig. 2 is a top plan View thereof partly in section.

1 is the fire box of a heater provided with the draft door 2. 3 is a casing surrounding the fire box, the draft door 2 being outside the casing. l is a vertically-extending rod fixedly secured at its lower end to the lower end or base of the fire box. 5 is a bar extending over the upper end of the fire box 1 and resting at 6 thereupon, the adjacent end 7 of the bar being pivotally connected to the vertically-extending bar 4, as at 8. The upper end of the fire box 1 has the annular crown portion 9 extending around its periphery, the arrangement being such that the bar 5 will always rest upon this annular portion regardless of the relative rotational movement of the bar and upper end.

The opposite end 10 of the bar 5 is normally located a substantial distance above the upper end of the fire box 1 and is pivotally connected at 11 to the depending link 12, the lower end of which is pivotally con nected to the inner arm 13 of a rock arm 14 pivotally mounted in the casing 3. The outer arm 15 of the rock arm is outside the casing 3 and is connected to the flexible member 16, such as a chain, the opposite end of which extends to a suitable point where inner arm 13 of the it may be manually adjusted. 17 is a second flexible connection which is connected to the draft door 2 and to the pulley 18 engaging the flexible connection 16.

Assuming the parts to be in position, as shown in Fig. 1, as heat is generated in the furnace the fire box 1 vertically expands, the length of the vertically extending rod 1 remaining substantially constant. The vertical expansion of the fire box raises the end 10 of the bar 5 by moving the bar 5 about its pivot 8. This in turn raises the rock arm 14 through the depending link 12 thereby lowering the outer arm 15 of the rock arm, which in turn permits of the lowering of the draft door 2 through the connections 16 and 17. The lowering of this draft door cuts off a portion of the air passing into the fire box, and as a consequence reduces the heat generated, thereby permitting of the fire box 1 returning toward its original position. As the fire box returns toward its original position the draft door 2 will correspondingly open, due to the fact that the bar 5 rests upon the upper end of the furnace and will swing downwardly about its pivot 8. Thus it is seen that with this arrangement any desired temperature can be automatically maintaiued.

Furthermore, it is seen that the desired temperature can be adjustably secured by manually adjusting the flexible connection 16, which in turn adjusts the draft door :2 through the connection 17.

What I claim as my invention is:

1. The combination in a heater of a fire box having a vertically expansible upper chamber terminating in an annular crown, a casing inclosing the fire box in spaced relation thereto, a draft door for the heater, a fulcrum member secured to the heater base and extending upward in the space between the heater and the outer casing, a lever pivotally engaging said fulcrum member and supported upon said annular crown on the side adjacent to said fulcrum, said lever having a multiplying arm extending from the point of bearing on said crown to the opposite side of the heater, and an operating connection between the free end of said lever and said draft door.

2. The combination in a heater of a fire box having a vertically expansible upper chamber terminating in an annular crown, a

casing inclosing the fire boxin spaced relation-thereto, a lever extending across said annular crown and having a bearing on said crown at one side thereof, a fulcrum for said lever on the side adjacent to the crown and independent of said expansible chamber, a draft door for the [ire box, and an operating connection beti'een the free end of the lever and said draft door.

3. The combination in a heater of a fire box having a vertically expansible upper chamber terminating in an annular crown, a casing inclosing the fire box in spaced relation thereto, a gravity closing draft door for the fire box, o )ening through the casing, a fulcrum bar secured to the base of the heater and extending upward in the space between said heater and outer casing, a lever pivotally secured at the upper end of said fulcrum bar and extending across said annular crown, said lever having a bearing on said crown on the side adjacent to said fulcrum, a connection for opening said draft door, and means extending through the wall of said outer casing forming an operating connection between the free end of said lever and said draft door operating connection, whereby the latter is closed and opened respectively on the expansion and contraction of said chamber.

at. The'combination in a heater of an expansible fire box, a casing surrounding said lire box and spaced therefrom, a fulcrum bar extending from the base of said heater upward within the space between the heater and said outer casing, a lever fulcrumed at the upper end of said fulcrum bar and extending across the top of the heater, said lever having a bearing on the top of said expansible iii-e box on the side thereof adjacent to said fulcrum, whereby a multiplying effect is produced,a draft door for said fire box opening through said outer casing, a rock shaft journaled in the walls of said outer casing having an inner rock arm connected to the free end of said lever, and an outer rock arm on said rock shaft connected with said draft door. 7 e r In testimony whereof I aflix my signature.

' WVILLIAM V. ROBINSON. 

